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  <title>Document</title>
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<body>
  <div id="root"></div>
  <p><a href="#/order/a11/23/2">button11--</a></p>
  <p><a href="#/order/a21/5/1">button21</a></p>
  <p><a href="#/order/a31">button31</a></p>
  <p><a href="#/order/">root</a></p>

  <!-- <p><button onclick="go('/aa11')">Button11</button></p>
  <p><button onclick="go('/aa21')">Button21</button></p>
  <p><button onclick="go('/aa31')">Button31</button></p>
  <p><button onclick="go('/aa101')">Button101</button></p>
  <p><button onclick="back('/aa101')">Back</button></p> -->
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